Procedure for Steering and Lift/Lower Gear Pump
Flow Test
8. If the total of the two flows is lower than 7 GPM or a
pressure of 1000 PSI could not be obtained, check for
restriction in pump intake line. If intake line is not re-
stricted, remove gear pump and repair or replace as
necessary.
Output from the steering and lift/lower gear pump sec-
tion is equally divided by a proportional valve to provide
flow to the steering circuit and the lift circuit. To test gear
pump flow, testing of both steering and lift/lower circuits
is required. Total gear pump flow is the combined flow
from the two circuits.
Ifthe total ofthe two flows is 7 GPM but individual circuit
flow is less than 3.5 GPM (e.g. steering circuit has 2
GPM and lift circuit has 5 GPM), suspect a problem with
the proportional valve in the gear pump.
1.
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2.
decks lowered and off. Make sure engine is off and the
parking brake is engaged. Raise seat.
Park machine on a level surface with the cutting
2
1
3
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS, and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
Figure 34
3.
IMPORTANT: Make sure that the oil flow indicator
arrow on the flow gauge is showing that the oil will
flow from the pump, through the tester, and into the
hydraulic hose.
1.
2.
Hydraulic tank cap
Lift circuit hose
Steering circuit hose
3.
With the engine off and cutting decks lowered, install
1
2
3
tester with pressure gauges and flow meter in series be-
tween the last gear pump section and one of the circuit
hoses (Fig. 34). Make sure the tester flow control
valve is open.
4.
speed. Check for hydraulic leakage and correct before
proceeding with test.
After installing tester, start engine and run at idle
4
IMPORTANT: The pump is a positive displacement
type. If pump flow is completely restricted or
stopped, damage to the pump, tester, or other com-
ponents could occur.
Figure 35
1.
2.
Gear pump backplate
Lift circuit
3.
4.
Steering circuit
Proportional valve
5.
Operate the engine at full speed (2730 + 30 RPM).
DO NOT engage the cutting decks.
6.
flowcontrolvalveonthetesteruntil1000PSIisobtained
While watching tester pressure gauges, slowly close
on gauge. Verify engine speed continues to be correct
(2730
+ 30 RPM). Record test results.
GAUGE READING TO BE: Flow approximately 3.5
GPM at 1000 PSI.
7.
move tester and reinstall disconnected hose. Complete
steps 3 through 6 for other circuit hose.
Open tester flow control valve and stop engine. Re-
Groundsmaster 4100--D
Page 4 -- 41
Hydraulic System
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